1326403540 has 144 divisors (see below), whose sum is σ = 3586633344. Its totient is φ = 407366400.

The previous prime is 1326403523. The next prime is 1326403549. The reversal of 1326403540 is 453046231.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1326403499 and 1326403508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326403549) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 764514 + ... + 766246.

It is an arithmetic number, because the mean of its divisors is an integer number (24907176).

Almost surely, 2^1326403540 is an apocalyptic number.

1326403540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1326403540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793316672).

1326403540 is an abundant number, since it is smaller than the sum of its proper divisors (2260229804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1326403540 is a wasteful number, since it uses less digits than its factorization.

1326403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 1326403540 is about 36419.8234482267. The cubic root of 1326403540 is about 1098.7322971638.

Adding to 1326403540 its reverse (453046231), we get a palindrome (1779449771).

The spelling of 1326403540 in words is "one billion, three hundred twenty-six million, four hundred three thousand, five hundred forty".